A modified admixture suitable for low-quality aggregate concrete and its preparation method

An admixture and concrete technology, which is applied in the field of modified admixture and preparation of low-quality aggregate concrete, can solve the problems of environmental protection and poor economy, and achieve the effects of low product cost, wide range of sources, and inhibition of segregation

Active Publication Date: 2017-09-26
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +2
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Problems solved by technology

[0004] The purpose of the present invention is to propose a modified admixture suitable for low-quality aggregate concrete and its modified admixture for low-quality aggregate concrete in order to overcome the shortcomings of existing concrete admixtures that do not thicken or thicken but do not strengthen or enhance but are environmentally friendly and economical. Preparation

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  • A modified admixture suitable for low-quality aggregate concrete and its preparation method
  • A modified admixture suitable for low-quality aggregate concrete and its preparation method
  • A modified admixture suitable for low-quality aggregate concrete and its preparation method

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with specific examples. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the protection scope of the present invention.

[0015] Table 1 shows the raw materials and mass ratio metered contents of the modified admixture suitable for low-quality aggregate concrete of the present invention.

[0016] Raw materials and mass ratio of each embodiment of table 1

[0017]

[0018] Prepare the modified admixture according to the following steps: First, weigh the raw materials according to the ratio shown in Table 1, add thickener and reinforcing agent in turn under the condition of stirring at a speed of 300r / min to 500r / min, and stir for 5min; Under the stirring condition of 100r / min, add the mother liquor of polycarboxylate superplasticizer, slump retaining agent, and antifungal agent in sequence, and continue stirring for 3 minutes;...

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Abstract

The invention relates to a modified admixture suitable for low-quality aggregate concrete and a preparation method thereof. The modified admixture includes the following raw materials in parts by mass: 40% to 60% of polycarboxylate water reducer mother liquor, 25% of reinforcing agent % to 50%, thickener 2% to 8%, air entraining agent 0.1% to 0.4%, slump retaining agent 2% to 5%, antifungal agent 0.01% to 0.04%. On the premise of ensuring that the low-quality aggregate concrete is easy to construct and the strength is not reduced, the invention can reduce the amount of concrete glue by 8% to 10%, suppress the segregation and bleeding of the low-quality aggregate concrete mixture, and effectively solve the problem of solid structure surface Honeycomb, pockmarked surface, large area of ​​air bubbles, color difference and cracking and other appearance quality problems, realize the local procurement of raw materials for concrete engineering in remote areas.

Description

technical field [0001] The invention relates to chemical building materials, in particular to a modified admixture suitable for low-quality aggregate concrete and a preparation method thereof. Background technique [0002] With the rapid development of my country's infrastructure construction, high-quality sand resources are becoming more and more scarce, while natural sand or machine-made sand with poor gradation or excessive fineness modulus exists in large quantities. Since sand is a local bulk resource, it is not convenient for long-distance transportation, and the contradiction between the supply and demand of concrete sand in the southwest and northwest regions has become increasingly prominent, and concrete construction units have to use low-quality aggregates. On-site investigations found that common problems such as segregation, bleeding, difficulty in pumping construction, water lines, sand lines, and honeycomb pockmarks are prone to occur when poor-quality river s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/24
Inventor 李享涛谢永江仲新华朱长华王保江王月华裘智辉苏婉玉孔庆欣何龙
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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